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INRIX network conflation: use OSM? #9

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chunhochow opened this issue Apr 10, 2023 · 4 comments
Open

INRIX network conflation: use OSM? #9

chunhochow opened this issue Apr 10, 2023 · 4 comments
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good first issue self-contained, good for newcomers/interns

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@chunhochow
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chunhochow commented Apr 10, 2023

Investigate using OSM road IDs to do conflation process. Would it be more robust?

Potential issues:

  • OSM segments are longer than SFCTA segments

Part of #8

@chunhochow chunhochow self-assigned this Apr 10, 2023
@chunhochow
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@chunhochow 's hypothesis is that OSM IDs were not available when the conflation script was first written. @joecastiglione suggests checking old INRIX shapefiles on Q:\ to verify.

@sdrewc said there's no OSM IDs in the INRIX XD shapefiles at Q:\GIS\Transportation\Roads\INRIX\XD

@chunhochow
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chunhochow commented Apr 11, 2023

According to XD Shapefile Field Definitions.docx and INRIX Analytics_OSM Reference Data_Technical_Specifications_v2.pdf in INRIX's 'MapUpdate Best Practices', INRIX generated a lot of the metadata on their segments from OSM. Supposedly each segment should have a segment ID which contains the OSM way ID within it.

However, I just looked at Bacon St in Portola, and none of the INRIX XD IDs (from Q:\GIS\Transportation\Roads\INRIX\XD\2301\INRIX_XD-SF-2301.gpkg) and the OSM way ID match up (the OSM way was last updated 3 years ago so it's not because it was recently updated).

I think this is probably an email-INRIX-to-ask question, because if they can provide OSM IDs (which it seems like they at least use them internally during their map generation), or if they can point us to where to find these OSM way IDs, it will probably make our lives easier.

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The OSM way ID - INRIX XD Segment mappings can be found in OSMConflation under each MapRelease at https://map-data-downloader.inrix.com/

@chunhochow chunhochow added the good first issue self-contained, good for newcomers/interns label Apr 13, 2023
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From Drew:

We have conflated champ and OSM networks before (Q:\Model Research\TNC\Data\network_conflation). Although there are newer networks (both CHAMP and OSM) and Bhargav developed better conflation tools (see #8), so it would be better to build a new correspondence. A challenge is that the relationship is many-to-many, so we'd have to keep a correspondence file rather than a simple champ network attribute.

Coincidentally, SFMTA just wrote to me about network issues they'd found using DPW's street centerline file (which we also use to give true-shape geometries to champ networks for display purposes) and were thinking about moving to OSM. I'm not sure exactly what their use cases are, but could be worth following up and possibly coordinating.

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